Bag Up Some Fun with Prom Swag Bags! These swag bags are filled with all kinds of memorable and cool favors for your Prom, Homecoming, Winter Formal, or your Senior Party. Save time and money with these pre-assembled packs of accessories! Some of these items are empty, waiting for you to pick out your own custom favors--you can also add custom details like imprints and text. DIY gift bags give your party a fun, friendly atmosphere!